Comer, Douglas E. Internetworking with TCP/IP Vol. I: Principles, Protocols, and Architecture , Third Edition . Indianapolis, IN: Prentice Hall PTR, 1995. ISBN 0132169878.
Doyle, Jeff. Routing TCP/IP Volume I (CCIE Professional Development) . Indianapolis, IN: Cisco Press, 1998. ISBN 1578700418.
Doyle, Jeff. Routing TCP/IP, Volume II (CCIE Professional Development) . Indianapolis, IN: Cisco Press, 2001. ISBN 1578700892.
Cisco article on basic NAT services: www.cisco.com/warp/public/cc/pd/iosw/ioft/ionetn/prodlit/1195_pp.htm.
RFC 950, RFC 1918. For a complete list of Requests for Comments: www.cis.ohio-state.edu/htbin/rfc/rfc-index.html.
Comer, Douglas E. 
Cisco article on basic NAT services: www.cisco.com/warp/public/cc/pd/iosw/ioft/ionetn/prodlit/1195_pp.htm. 